Discussion
The petroleum product having more than \(\text{C}_{50}\) will be known by :
Answer: D
The key gives coke for the fraction above \(\text{C}_{50}\).
In the usual table of petroleum fractions by carbon number, the lightest products are gases and naphtha (roughly C5-C10), followed by kerosene, diesel, lubricating oils and waxes in the C20-C40 range. Material heavier than about C50 stays as the distillation residue, from which bitumen and petroleum coke are produced.
Naphtha is a light fraction, wax lies below C50, and gel is not a petroleum fraction, so of the options only coke belongs to the heaviest residue.
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